• Added: Support for Python 3.13.
• Added: skfem.autodiff module for linearizing nonlinear variational forms
  and solving them using the Newton method.
  This is done
  with the help of the new decorator NonlinearForm.
  There are currently two examples using this functionality: ex45 and ex51.
  The use of skfem.autodiff requires the optional
  dependency JAX.
• Added: A corresponding set of helper functions skfem.autodiff.helpers
  for defining nonlinear variational forms.
• Removed: Support for Python 3.8.